PDF malware analysis — malicious · d51da56dab909d85

MALICIOUS

PDF

9.4 KB

MD5: 27c3d14dadab5916714b898155162460 SHA-1: 91b7547a099e7ad270506ec65a342507b2f20c90 SHA-256: d51da56dab909d853bd83c17fb8bff0cb7d064431cd0c214be980a0d05dbffd0

62 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF utilizes XFA forms and contains embedded JavaScript, flagged by both heuristics and ML classification. The embedded JavaScript, specifically 'acroform_b64_00.js', appears to be heavily obfuscated but likely attempts to download and execute a second-stage payload. The presence of these elements strongly suggests a malicious intent, likely for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 3

Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00001d3d.js` `367ec4d73b3719c0d903067311b86eb113cba42773c76a8fb31fc47f43567188`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D3D	4660 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).
`acroform_b64_00.js` `949cdeef4e7ee0784bce540877e1244e2f0f1b06f86a1db95bb0f0fbcbf970de`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0xE9	8736 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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